klang



Aug. 18, 1959 L. R. KLANG 2,899,734

CONCRETE BLOCK MOLD Filed Sept. 16, 1957 FIG.I.

INVENTOR LEON R. KLANG ATTORNEYS.

United States Patent CONCRETE BLOCK MOLD Leon R. Klang, Fulton, Mo.

Application September 16, 1957, Serial No. 684,279

' 3 Claims (Cl. 25--118) or curing period, and for the introduction of additional moisture during that period, if desired, for increasing the strength of the product. Another objective is the provision of an inexpensive disposable mold liner which is intended to remain on the casting until ready for use to protect it during shipment and handling.

The invention resides in a mold including a receptacle of desired interior shape having sidewall portions which are separated from each other at the corners and are flexibly joined to the bottom of the receptacle so that they may be flexed to facilitate removal of a casting. A liner of water impervious sheet material is arranged to cover the inner surfaces of the bottom and sides of the mold receptacle and is extended outwardly thereof at the corners of the receptacle through narrow spaces which intervene adjacent sidewalls, the outwardly projected portions of the liner constitute auxiliary chambers communicating with the principal mold cavity, the chambers, acting to hold liquid or thin mix which tends to drain away from the moldedbody during the early stages of the setting or curing period, and to restore it to the casting during later stages of that period. Additional water may be supplied during the curing stage, introduced into the auxiliary pockets. As will be understood, the pockets collect any excess molding material which in former molds tends to escape, especially when the mold is vibrated, and thus aid in keeping the outer surface of the mold and any attending equipment clean and free from the cement or plaster mixture.

In the drawing,

Fig. 1 is a plan view of the present mold with a part of the liner element removed;

Fig. 2 is an elevational view thereof; and

Fig. 3 is a fragmentary sectional view taken at line 3-3 of Fig. 1.

Describing the invention in greater detail and with reference to the drawing by designating numerals, the body of the mold comprises a pan-shaped receptacle 5 formed of sheet metal and having a bottom 6 and up standing sidewalls 7 whose end edges are separated from each other in the provisions of relatively narrow openings or passages 8 at the corners of the mold receptacle 5. As thusly described it will be understood that the sides 7 'of the receptacle are joined to the bottom Wall, and the sheet material from which the article is fabricated is such as to enable the sides 7 to be flexed outwardly to facilitate removal of the molded product.

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The mold cavity is provided with a lining, constituted in the present example by a rectangular sheet 9 of moisture impervious material. It is my preference to employ for the purpose wax paper, although metal foil, cellophane, or other suitable sheeting may be used. If desired the lining material may be suitably embossed so as to impart a pleasing design on the surfaces of the casting.

In practice, the lining material 9 is laid into the cavity of the mold member 5 and pressed against the inner surfaces so as to conform thereto without unwanted wrinkles or distortion. In the corner areas the surplus lining portions are drawn outwardly of the receptacle 5 through the corner openings 8, as best appears in Fig. 1, thus removing those extra portionsfrom the interior of themold. The outwardly projecting corner parts, designated 10, may if desired be folded flatly against the outer surfaces of the sidewalls soas to allow a number of the prepared molds to be grouped closely together as for filling. More desirably, however, the projecting corner portions 10 are expanded in the formation J of conical cups or corner pockets. Theseaiford auxiliary chambers 11 which communicate with the main cavity of the mold through the narrow corner passages 8. The liner 9 is desirably of a size to extend upwardly beyond the upper edge of the sidewalls 7 and thereby increase the effective depth of the mold cavity, with increased capacity to retain the cement or other mixture and to prevent spillage.

Thereafter the cement or other mixture is introduced into the mold cavity. As is the customary practice the unit is placed on the table of a vibrating machine to impact the mixture and eliminate air pockets. During this stage of the process some of the liquid and fine cement particles will pass through the corner passages 8 and into the pockets 10. This thin mixture is allowed to remain in the pockets and may be supplemented with additional water immediately or after a short setting period. In the latter stage of the setting period some of the surplus liquid in the pockets 11 will be absorbed into the body of the casting replacing liquid which has evaporated therefrom, with beneficial strengthening effect and generally improved quality of the casting.

After a relatively short setting time the projecting corner portions constituted by the cups 10 and any solidified contents thereof are removed by simply breaking them oif of the main body. The molded product with attached liner 9 is then removed from the mold receptacle 7. Removal is facilitated by flexing the side walls 7 outwardly sufficiently to free them from the cast body. The mold 7 is thereupon available for immediate subsequent usage, the lining having keptthe surfaces clean and free from cementitious material. Because the lining mem bers themselves constitute protective receptacles the castings may be removed from the molds 5 after a much shorter setting period than is practical with former molding procedures. The lining sheet material is allowed to remain as a protective covering for the bottom and side surfaces of the block, and being moisture impervious it retards evaporation, prolonging the setting period and augmenting the strength characteristics of the unit. The covering may be allowed to remain with the unit during shipment and until ready for actual use, serving as a protective wrapper untilthat time.

Having described my invention, it will be understood that certain changes may be made in the means which has been described, without departing from the spirit and intention of the invention which is defined by the appended claims.

I claim as my invention:

1. A mold comprising a receptacle of an integral sheet material having a bottom and side walls flexibly and rigidly joined to said bottom, said side walls providing corners on the receptacle, the end edges of the side walls at-a corner of the receptacle being separated from each other to form a narrow opening, an integral removable water impervious sheet material lining fitting loosely on the inside of said receptacle, said lining having a portion thereof projecting outwardly of said receptacle-through said corner opening to provide anfexternal chamber, the walls of the portion of said lining through said narrow opening being spaced apart appreciably to-form a clear passage between said external chamber and the interior of the receptacle, whereby liquid in said mold will 'drai readily to said external chamber.

2. A mold comprising a receptacle of an integral sheet material having a bottom and side walls flexibly and rigidly joined to said bottom, said side walls'providing corners on the receptacle, the end edges of the side walls at a corner of the receptacle being separated from each other to form a narrow opening, an integral removable water impervious sheet material lining fitting loosely on the inside of said receptacle, said lining extending upwardly beyond the upper edges of said side walls and having a portion thereof projecting outwardly of said receptacle through said corner opening to provide an external chamber, the walls of the portion of said lining through said narrow opening being spaced apart appreciably to form a clear passage between said external chamher and the interior of the receptacle, whereby liquidin said mold will drain readily to said external chamber.

3. A mold comprising a receptacle of an integral sheet material having a bottom and side walls flexibly and rigidly joined to said bottom, said side walls providing corners on the receptacle, the end edgesof the side walls at a corner of the receptacle being separated from each other to form a narrow V-shaped opening, an integral removable Water impervious sheet material lining fitting loosely on the inside of said receptacle, said'lining extending above the upper edges of said side walls and having a portion thereof projecting outwardly of said receptacle through said corner opening to provide a funnel-shaped external chamber, the walls of the portion of said lining through said narrow opening being spaced apart appreciably to form a clear passage between said external chamber and the interior of the receptacle, whereby liquid in said mold will drain readily to said external chamber.

Tuttle et a1 Apr. 21, 1903 Fleming Jan. 7, 1913 

